If you’re looking to transform your unused loft space into a bright and functional room without altering the shape or structure of your existing roof, a Velux loft conversion – also known as a roof window conversion – could be the perfect solution.
It’s one of the most cost-effective and least disruptive types of loft conversions available.
What Is a Velux Loft Conversion?
A Velux conversion involves installing specially designed Velux roof windows directly into the slope of your existing roof. Unlike dormer or hip-to-gable conversions, this style does not involve changing the roof’s structure or adding additional head height, making it quicker and often more affordable to complete.
These conversions are ideal for lofts that already have a good amount of headroom, and where minimal external alterations are desired. They are often chosen for homes in conservation areas or for those seeking to retain the original roofline.
Maximise the Natural Light in the room Without Altering Your Roofline
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Key Benefits of a Velux Roof Window Loft Conversion
✅ No Major Structural Changes
Since the roof shape remains untouched, there’s no need for large-scale construction or alterations-keeping disruption to your home to a minimum.
✅ Floods Your Loft with Natural Light
Velux windows are renowned for their ability to maximise sunlight, making your new space feel airy and bright all day long.
✅ Planning Permission Not Always Required
In many cases, Velux conversions fall under permitted development rights, meaning you might not need planning permission. We’ll always advise you and handle all required approvals.
✅ Faster Construction Time
With no need to alter the roof structure, Velux loft conversions are usually quicker to complete than other types—often in as little as 4-6 weeks.
✅ Cost-Effective
This is one of the most affordable types of loft conversions, making it ideal for homeowners on a budget who still want to add value and space to their home.
Ideal Uses for a Velux Loft Conversion
Because of their simplicity and great light access, Velux conversions are popular for creating:
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Spare bedrooms
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Home offices
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Children’s playrooms
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Hobby or craft rooms
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Quiet reading nooks or study areas
We tailor the interior design of your conversion to suit your needs, helping you make the most of your space.
Velux Roof Window FAQs
Will I Need Planning Permission for a Velux Conversion?
In most cases, planning permission is not required—especially if the windows don’t project beyond the plane of the roof slope at the front of the house and are installed on the rear. However, every property is different. For example, if your home is in a conservation area, or if you plan to install larger roof windows or raise the roofline, permission may be needed.
Regardless, building regulations approval is always required for any loft conversion. This ensures your conversion is structurally sound, safe, energy-efficient, and compliant with UK standards. Our experienced team handles all regulatory paperwork and ensures full compliance from start to finish.
How Much Does a Velux Loft Conversion Cost?
Velux conversions are typically the most affordable option, with prices starting from £25,000–£30,000+ VAT, depending on the size of the space, number of roof windows, insulation needs, and interior finishes. We provide clear, transparent quotes with no hidden fees.
Why Choose Us for Your Velux Roof Window Loft Conversion?
At Garnet Construction, we’ve helped countless homeowners across Hertfordshire, Essex, and North London unlock the potential of their lofts through expert Velux conversions. With a trusted team of designers, builders, and project managers, we handle every stage of your project—from planning and building regulations to final decoration.
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⭐ Local, trusted builders
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⭐ Fully insured and qualified
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⭐ End-to-end project management
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⭐ Free consultations and no-obligation quotes
Loft Conversion Projects
Loft Conversion | Sidney Road, Forest Gate
This L-shaped dormer includes a master bedroom and a shower room. It's different because the 2...
Loft Conversion | Hamilton Road
Project Overview Location: Hamilton Road Property: Job Type: Loft Conversion "Coming Soon"
Loft Conversion, Extension & Renovation | Beacon Way, Rickmansworth
Project Overview Location: Rickmansworth Property: Detached Job Type: Full Renovation "Coming...
Loft Conversion | Beresford Road, Harrow
Project Overview Location: Harrow Property: Conversion Type: Rear Dormer Rooms: Time Taken:...
Loft Conversion & Extension – Arlington Road
Project Overview Location: London Property: End-of-terrace Job Type: Dormer & Extension...
Rear Dormer Loft Conversion – Essex
Project Overview Location: London Property: End-of-terrace Conversion Type: Rear Dormer Rooms: Two...
Rear Dormer Loft Conversion With En-Suite
Project Overview Location: London Property: End-of-terrace Conversion Type: Rear Dormer Rooms: Two...
Rear Dormer Loft Conversion – Bentley Drive Church Langley
Project Overview Location: Essex Property: End-of-terrace Conversion Type: Rear Dormer...
Double Pitched Roof Dormer
Project Overview Location: Essex Property: End-of-terrace Conversion Type: Rear Dormer Rooms: Two...
Rear Dormer Loft Conversion- RM6
Project Overview Location: London Property: End-of-terrace Conversion Type: Rear Dormer Rooms: Two...
Book Your FREE Consultation Today
What type of Loft Conversion should I have?
Velux / Roof Window Conversion
Roof window or velux loft conversions are often an attractive option for homeowners due to their ability to fit into the line of the roof; thus not necessitating any restructuring of the roof itself. The installation of such windows will provide the loft space with substantial light. A Velux roof window conversion will sometimes not require planning permission, although they will always require building regulation approval.
Find out more about Velux Roof Window Loft Conversions
Dormer Loft Conversion
A dormer is a window-featured extension of the roof, usually installed to provide more space and headroom within the loft, in addition to improved staircase access. Dormers are also popular due to the aesthetic enhancement to a property that they provide. In the UK, the installation of a dormer is subject to planning permission requirements from the local authorities.
Find out more about Dormer Loft Conversions
Hip-To-Gable
A hip-to-gable conversion is the building up of the gable-end wall elongating the pitch of the roof all the way across the property. Like dormers they are usually installed to provide more space and headroom within the loft, in addition to improved staircase access. Hip-to-gable conversions are typically seen on end-of-terrace or semi-detached properties. In the UK, the hip-to-gable conversion is subject to planning permission requirements from the local authorities.
Find out more about Hip-to-Gable Loft Conversions
L-Shaped
The L-shaped loft conversion is a popular choice on period Victorian and Edwardian properties, where additional space can be added to the rear of a dormer conversion, above a rear elevation protruding from the property creating an L-shape. They often provide space for additional bedrooms or bathrooms over and above the standard dormer, so are a popular choice across London. In the UK planning permission is required from the local authorities for the L-shaped conversion.
Find out more about L-Shape Loft Conversions
Mansard
A mansard conversion is a four-sided gambrel-style hip roof characterised by two slopes on each of its sides with the lower slope, punctured by dormer windows, at a steeper angle than the upper. The steep roof with windows creates an additional floor of habitable space, also known as a Garret, and reduces the overall height of the roof for a given number of habitable stories. The upper slope of the roof may not be visible from street level when viewed from close proximity to the building.
Find out more about Mansard Loft Conversions
